Grate for furnaces



( No Model.) 2 Shets$heet V 1.

L. PASSMORE.

GRATE FOR FURNAGES.

. No. 317,184. Patented May 5; 1885.

III/ll UNITED STATES I PATENT O FICE.

LEVIS PASSMORE, OF PHILADELPHIA, PENNSYLVANIA.

GRATE F'OR FURNACES.

SPECIFICATION forming part of Letters Patent No. 317.184, dated May 5, 1885.

Application filed January 12, 1885. (we model.)

To aZl whom, it may concern:

Be it known that I, LEvIs PASSMORE, a citizen of theUnited States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Grates for Furnaces, of which displacement of the bars, and providing for the ready renewal of any of the bars which may become defective.

In the accompanying drawings, Figure l is a perspective View of my improved grate, a portion only of the bars being shown; Fig. 2, a section of Fig. l on the line .1 2; Fig. 3, a sectional perspective view of parts of adjoining gratebars and the supportingbar; Fig. 4, a section on the line 3 4, Fig. 1, with all the bars in place, and showing how the supporting-bar is set in the brick-work; Fig. ,5, a sectional plan on theline 5 6, Fig. 4; Fig. 6, an end view of one of the supporting-bars, with its shoe and the surrounding brick-work; and Fig. 7 an enlargement of part of Fig. 5.

The grate proper consists of a series of bars, A, each bar consisting, in the present instance, of two plates, at a, connected together midway between the opposite ends by a substantial cross-piece, Z), near each end by a cross-piece, e, and at intermediate points by cross-pieces d, the whole being cast in one piece. While I prefer this duplex bar, and shall refer to it hereinafter in describing my invention, the

main feature of the latter may be carried into effect by the use of single bars or bars composed of more than two plates.

Midway between the opposite ends of each bar, on the under side of the same and forming part of the bar, is a tapering projection, f, the projections of the several bars fitting in openings h in the main supporting-bar D. This supporting-bar extends across the fire-place, to V the walls of which the ends of the supporting bars are firmly secured in the manner shown in Figs. 4, 5, and 6, and described hereinafter. This combination of grate-bars and supporting-bar permits the ready withdrawal of any one of the bars which has become deteriorated by the intense heat to which grates are subjected, and the ready introduction'of a new bar.

I prefer that the bars shall not rely for their steadiness entirely on the fitting of the pro jections f into the openingsof the bar I), and therefore make a V-sl1aped recess, m, in the under side of each web-plate aof each duplex bar, the inclined sides of .therecesses bearing upon the corresponding inclined top of the supporting-bar, as shown-in Fig. 2, a steady support for the grate-bar being thus afforded, and the top of the bar presenting no flat surface for the lodgment of ashes.

It is desirable that the portionof the gratebars in contact with the supporting-bar should be as limited as possible, so that the intense heat of the said bars may not be communicated to the supporting-bar, and wherever such contact occursthe metal at and near the points of contact should be exposed to the air as it rushes from below to the grate. j

The grate-bars are maintained at their proper distances apart by the usual projections, z, and there is a free passage of the air through the openings between the plates a of each duplex bar.

Very little of the surface of each tapering projectionfbears against the metal of thesupporting-bar, as can be best explained by reference to the enlarged view, Fig. 7, in. which it will be seen that the projection f bears at the points x, with its corners only, against the metal of the bar D, the sides and ends of the opening forming passages w for the air, so that a plentiful supply of air is always near the points a, where the said projections f bear against the supporting-bar. The only other 90 points of contact are where the edges of the V-shaped recesses of the bars rest on the inclined top of the supporting-bar, and these bearings are very narrow, and so situated that air is passing rapidly to the grate on both sides of each bearing. j

The contractedbearingsm for the projections y f of the grate-bars may be on the sides of said j, projections instead of at the corners, if desired, 1 j as shown by dotted lines in Fig. 7 butthecorner bearings are preferred.

Each end of the supportingbarDofthegrate is adapted to a shoe or socket, J, resting on the brick-work structure at the side of the grate; and in order to insure a snug bearing of the bar in said shoe without expensive fitting, the bar has on each side, near the end, lugs n, which can be readily chipped or filed to fit the shoe.

In order to still further bind the bar D a wedge, 12, is driven between the top of the same at each end and the upper course of brickwork shown in Figs. 4. and 6. By this means the bar D is rigidly held in place, and, as the grate-bars are rigidly supported by said bar D, the upper surface of the grate presents a level surface, offering no obstruction 'to the free movement of the slicing bar.

The shoes J are contained within the brickwork structure of the furnace, so that the desired long bearing for the bars D is secured, and yet the grate-bars are brought close up to the said brick-work structure, as shown in Fig. 4.. In this respect my invention differs from furnaces which have been devised, in

which the sockets for supporting the transverse bars of the grate form part of plates built into the walls of the furnace, the sockets themselves, however, projecting from the walls.

I claim as my invention 1.. The combination of the grate-bars, each having a projection, f, with the supportingbar having openings for the reception of said projections, each opening forming contracted bearings and air-spaces, as specified.

2. The combination of the grate-bars, each having a projection, f, with the supportingbar having openings forming corner bearings, 00, and air-spaces w, as set forth.

3. The combination of the grate-bars, each having a projection, f, and recess m, with the supporting-bar having openings h, for the reception of the projections f, and an inclined top adapted to the recesses m, as specified.

i. The combination of the grate-bars, the supportingbar D, the brick-work structure, and the shoes J, contained within said structure and receiving the ends of the bar D, as set forth.

5. The combination of the grate-bars, the supporting-bar, the chipping-lugs n, and the shoes J, as set forth.

6. The combination of the grate-bars, the supporting-bar, the brick-work structure, the shoes J, and the wedges p, as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEVIS PASSMORE. XVitnesses:

HENRY BossERT, HARRY SMITH. 

